maples do not have foliage at this time of the year in my region. They had some old, not so good looking still and I have carefully taken off everything. This is for them to look good. And they will got into the greenhouse next week. i don't want all these leaves in there.

minus five degrees Celsius should be then lowest. The thermostate is set at minus 1, but it can get down lower. It should ntot be warmer than 10 to 15 plus. I open the doors whenever the sun is shining. Because of the greenhouse effect it could get over 20 plus.